Abstract: An ignition device for an internal combustion engine comprises a generating coil, an ignition circuit including an ignition capacitor, a signalling coil connected to the ignition circuit, and a switching means which renders the ignition signal to become ineffective on the basis of the latter half cycle of the ignition signal generated from the signalling coil and renders the ignition signal to become effective by releasing the ineffective condition of the ignition signal on the basis of the former half cycle, whereby the ignition signal is supplied to the ignition circuit within an ignition signal ineffectual period.

Abstract: An ignition timing control apparatus for an internal combustion engine such as an outboard motor is disclosed. The ignition timing control apparatus has a throttle switch, interlocked with a throttle valve, including a first contact closed when the throttle valve is fully opened and a second contact closed when the throttle valve is fully closed. In the former case, the ignition timing of the engine is retained in an advanced angle, thereby enhancing the acceleration while in the latter case, the ignition timing is retained in a retarded angle, thereby enhancing the deceleration. When the first and second contacts are both opened, the ignition timing is advanced corresponding to the engine speed.